Method of making heat-radiating fins.



C. A. ELIGH. METHOD OF MAKING HEAT RADIATING FINS.

Patented Feb. 19, 1918 a snsnssnzn l.

APPLICATION FILED AUG-13. 19l5- c. A man. METHOD OF MAKING HEAT RADIATING FI NS. APPUCATION FILED AUG-l3, 1915- Patented Feb.19,1918.

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C. A. HIGH. METHOD or MAKING HEAT RADIATING FINS.

APPLICATION FILED weds. 1915.

PfitBIltOd Feb. 19, 1918.

a suns-sneer :4.

CHARLES A. ELIGI or nnrnorr, MICHIGAN, ASSIGNOB To LONG MANUFACTURING COMPANY, or nnrnorr, MICHIGAN, A conroran'rron or MICHIGAN.

METHOD OF MAKING HEAT-RADIATING FIN S.

Specification or Letters Patent. P t t d F 19, 1913,

Application filed. August 13, 1915. Serial No. 45,285.

To all whom it may concern: Be it known that I, CHARLES A. ELIGH, a citizen of the United States, residing at 'Detroit, "Wayne county, Michigan, have invented a new and useful Method of Making Heat-Radiating Fins, of which the following is a full, clear, and exact description.

The present application is related to my application, Serial No. 17852, in which I showed and claimed a corrugated fin for radiators. In the present application I disclose .andclaim a method of making the fin. For various reasons, mentioned in said application, the finsare made out of straight strips of sheet metal, and it is desirable, though not essential, that the edges of the strips be strengthened, which is preferably done byfolding them over and reinforcing .one edge by a wire confined in the fold.

Briefly the method of making the fins is as 7 follows: The metal, in a roll, is mounted on a machine which automatically folds the edges, places a wire in one of the folds and cuts the metal off in pieces of the requlred length These pieces are then passed bet t The corrugations are deepest at the edge which is not I wired and their depth gradually diminishes until they disappear at the wired edge. This produces a curvature in the str1p In its own plane. The strip is then put into ,a d e having aface withcorrugations complementary to its own and perforated. The str p is held against this perforated face while being perforated and is thus protected from distortion under the action of the perforatpunches.

l In the accompanying drawings,

Figurelfis an elevation of the machine for preparing the edges .of the metal and cutting it into lengths.

Fig.2 is'a detail showing the rollers located at A whereby the first operation 18 performed on the edge.

.fFig. 3. shows rollers located at B, Fig. .1 which perform the second operation, the

gw-ire. meanwhile having entered .one of the melee.

" folds.

Fig. 4&5 a tool located at C, Fig.1, arranged to press the free edge of the fold Fig. 5 shows the rollers seen D, Fig. 1, for finishingthe. edges. p

Fig. .6 is a plan view of the .corrugating Fi 7 is an elevation of the corru atin q a: a machine.

Fig. 7 is a fragmental sectional vlew showing'the relative position of the portion relative position of the ends of the corru-,

gating rolls adjacent to the wired edges of the strip, where the corrugations are re quired to die out. d Fig. '8 is an elevation of the perforating Fig. 9 is a transverse section of the perforating die.

Fig. 10 is a plan of the lower portion of the perforating. die.

Fig. 11 is the finished fin. Referring to Fig. l, a bed is supported by a frame 26 carrying a revoluble shaft 27. At the end of the bed the frame extends above the bed and forms guides for a reciprocating head 28 which is connected by pitnien 29 to eccentric straps30 surrounding eccentrics 31 rigidly secured to shaft 27.

A stationary shear blade 32 is secured to the end of the bed, and thehead carries the companion shear blade 33. A clamping plate 34: carried on the lower, ends of a pair of rods 35 is arranged to press down on the bed during a certain part of each revolution ofithe shaft 27. The rods pass through a flange 36 projecting from the head, and springs 37, preferably rubber, .are confined The shaft is rotated by a belt on the pulley 38. A gripper 50 is mounted to slide on the bed 25 and is connectedby a pitman 51' to a wrist pin 52. The wrist pin is carried by a block arranged to slide on an arm 53, a

pair of rollers and under the table the metal from reel passes up through ,a slit' 65 between the clamping plate a'ndsaid flange.

A reel 64 carrying wirepasses beneath a stationary bar C hav' ing ajv-shaped-groove in its lower edge" '(see; F1g.- 4;)5; which turns the edge down "1 around the wire.- The met-alnext -passes be i tween rol-lers (Fig; whichroll then ietal V jclosely around the ire and roll the other edge down flat. Having passed through the severalforrning devices whereby its edges are" prepared, thelinetal passes through'the 7 1 gripper-to thefshears The' gripper-has a :spring pressed gripping pawl 72,;bel0wf which theimetalpasses and it is pressed by the gripping pawl against the bottom ofthe V The pawl is placed at such an .anglewith reference to the metal that when r ppe the'g'ripperfmoves toward the head 28- frica or tion, assist'edfby the vpawl spring, tends'to swing the. pawl dow-nward and v grip the metal. 'By this' means thelimetal is pulled through the several forming devices.

v Th6Cal1'1S 31 are so set on the shaft with. refer w t e m 5 tha the ampi plate 3l isbrou'ght downon the metal just as the pitrna'n' 51 p'asses over the center with f the gripper .at the head end of" its stroke, ,The rubberfsprings 37 yield and allow; the a i headlto continue inoving downward"which '40 shears oflthe meta-l." The-gripper ismean eventuallv'brings the blade 83' down and while moving away-fromthe head and be- Qcau'se" otithe angularitv of. the gripping" pawl and the fact thatthe metalisclamped .on the.' bed byf plate 34 the metal slips 'f'through the grippen- ,Thecains are so'tirn'ed j that the plate; 34' is: lifted from the metal,

- 'just'as theipitrnan goes over the" center at ithe end-of the rearward strokeof the v I nay carry the- 'rnetal-with it.' It: is. evident V from' theffo'regoing that; the-operation is ;'a1 itor natic" andithat the prepared metal is ;cut to; uniforrm; lengths, Thei; particular if-orrn preparation of the edges; takes is imgrippen sojthat as the gripperi returns it rnaterial, and? since "the devices described a V are somewhat -.similar to those twellknojwn, v in the art'it is' evident-that considerable variation in-thetreatrnent of themetal' ispos- '7 $6 a r a hai cut/i0 lengths without any operation on sible. Moreover', the metal may, if desired,

f. The prepared strips are, corrugated the anachine shown 'inFigse 6 and Z i-n whichia pair of corrugate'drolls, 80 and 8 1, are

gferna le portion of the di -'91. is secured (not shown): press the bearings: upward and each bearing maybe pressed down" in opposition to its "spring by a-screw 8s, This is a g-inounted to rotate between uprights 82,Ha belt on pulley 'i831driViIlg ithejrollswhose' 'corrugationsenniesh like geari'teeth} Roll "80 rotates in bearings formed in the uprights-82; witness 11 81 rotates in bearings (not shown) arranged to slide up and down 'in guidesfformed in said uprights. Springs well; known} construction and isi suflicient' to say that the upper roll my" be "{so' ad-' justed with referenceto the lowerlone that the corrugations formed in the stripsfwill be deepest at: one edge; the de pth gradually din'n'inishing I until the corrugations 1 disap:

pear at 'the other' edge; This produces a curvaturein'the strip l'in its own plane; The netal lies on a bed;85 and the wired edge passes througha tubular guide'86, a roller 87 holding the remainder'of the strip=down togthe'bedr "By nea nsof the screws 84 the v a "machine can beadju sted so as to'irnpart any desired curvature; to the strips. This will Lbe understood :by-reference. to: Figs; ,7 and 7 In the latter figure 'the fin;.is';repre' 'sented by a straight line, this. being the lpo'rt'ion of the fin'contiguous to the wired ,yedge. Atthis point ,the rolls are vseparated so as not'to corrugate the. fin. 'In :Figs

Y fthe' fin shown with corrugations nearly as deep as :those of'the rolls, this representing the unwired edgeof vthe fin.

The depth of" enmeshrnent of i the "rolls may be. varied'so as to increase'or-diininish the depth of theIcQrrugati nS imparted to this "edgeof the-fin, and itdsgcle'ar that the f vdeeper the corrugationsin thefin. are made the shorter will" the unwired edge become and 7 the greater Willi-be the curvature .of

- The stri s aregnext" fier'ffirdth die;

shoWninFiQs'. 8, Q Iand 10. 'This' die cornprisesa base 90 and top 91', the latter having guide pins 92 which slideinthe base. Above the base a stripper plate 9:4: 7 is supported by i V springs 95-. I QPunc'hesQG -Set in thelbaseex- 7 tend up intoholesinthe stripper plate. The

v to the under sidec'of he top andlhasholes 98 into whichthe punches enter, the edges of the h'olesandpcorners ofjthepunches acting y as shears.- The die has the form of the corrugated strip and its surface has corrugae -tions; complementary to thosewf-the Ifin.

corrugated strip andiis bounded by a-fran e '120 v -Ther stripperplate ha al'so the forin of ther99 which acts-asza guidefor locating the strip-,1 The surface' of the stripper alsojhas corrugations complementary to those of the strip]. The die iis p'laced' inf'an ordinary punchpress an'd inoperationfthe strips are laid onthe stripper] Whenth'e press comes [down it pressesthe diegdown on the strip, ;Whih is therefore clamped between' tlie two corrugated surfaces. Continuing downward the press forces the stripper downward in opposition to the springs and forces the punches [through the strip, shearing out piece the shape of the punches, these pieces,

Q called slugs, passing up into the holes 98. Corrugations on the stripper are not essential though they are preferable. The surface may belevel, and, if desired pointed pins may be placed in suitable positions to act as a. sort of substitute for corrugations. Corrugating the face of the die, however, serves torprotect the strip from distortion by the punches, and corrugations on the stripper assist in this protection. As the press rises the springs force the stripper plate upward, thus lifting the strip,'which isnow a finished fin, off of the punches.

Having described the machines for per forming the several operations, what I claim is as follows: a

l. The herein described method of making heat radiating fins, which consists in corrugating a flat strip of metal in such a manner as to impart curvature to the strip in its own plane, then punching apertures in the strip, holding and supporting the strip while i the punches travel from the top to the bottom of the corrugations, in such manner as to prevent the deformation of the corrugations.

2. The herein described method of making heat radiating fins which consists 1n corrugating a flat strip of metal with corruga-.

tions which begin at one side of the strip and gradually die out as they approach the I other side of the strip, and in corrugating Copies of this patent may be obtained for forming said corrugations in such manner as to impart a predetermined and uniform curvature to the strip in its own plane, and thereafter perforating the strip, holding and supporting the strip while the punches travel fromthe top to the bottom of the cordiminish in depth as they approach the opposite edge to shorten the edge of the strip havlng deep corrugations and thereby curve the strip and maintain it in its own plane, and thereafter perforating the strip.

4:. A method of making fins for radiators, comprising strengthening of the edges of the strips of metal, corrugating of said prepared strips in such a manner as to impart curvature thereto in their own planes, subsequently perforating the strips, and supporting said strips to prevent deformation of the corrugations while they arebeing perforated.

5. The herein described method of making heat radiating fins which consists in corrugating a Hat strip of metal with corrugations which begin at one edge of the strip and gradually die out as they approach the other edge, thereby shortening one edge and to a gradiiially diminishing extent the intermediate portions of the strip, and in corrugating forming said corrugations so as to produce a predetermined and uniform cure vature of the strip in its own plane without stretching the metal thereof, and thereafter perforating the strip with perforations which are indiscriminately located with respect to the corrugations, holding and supporting the strip while perforating it, so as to preserve the curvature.

6. The herein described method of making heat radiating fins which consists in first shaping the edges of a flat strip of metal and concurrently wiring one edge thereof, thereafter corrugating the strip with corrugations which are deepest at the unwired edge and gradually diminishing in depth as they approach the wired edge, thereby shortening the unwired edge and to a gradually diminishing extent the intermediate portions of the strip, so as to produce curvature of the strip in it own plane, and thereafter perforating the strip.

In testimony whereof I affix my signature in the presence of two subscribing witnesses.

CHARLES A. ELIGH.

Witnesses J. L. DRYDEN, J. VERNON KE P.

five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

